a whiteout

Definition

A whiteout is an idiom used to describe a situation where visibility is completely obscured, usually due to dense fog or heavy snowfall.

Examples

The snowstorm caused a whiteout on the highway, so no one could see the road.

The fog was so thick, it created a whiteout in the city.

Origin

The origin of the phrase is uncertain, but some believe it is derived from the military term “whiteout condition” which describes the same phenomenon.